Head motion for looms



Dec. 31, 1957 A. H. LANDRY 2,818,085

HEAD MOTION FOR Loomsh l Filed Dec. 27, 1955 l 2 Sheets-Sheet 1 A f7-CENE VS Deir 31, 1957 A. H. LANDRY 2,818,085

HEAD MOTION Foa LooMs Filed Dec. 27, 1955 2 Sheets-Sheet 2 2,818,085 HEAD MOTION FOR LOOMs Adolphus Henry Landry, North Miami, Fla. Application December 27, 1955, Serial No. 555,477 z claims. (Cl. 139-49) This invention relates to textile machinery, and more particularly to an improved head motion for looms.

The main object of the invention is to provide a novel and improved head motion for looms of the type including a plurality of rotatable cams drivingly coupled to respective jack levers controlling the movements of the harness elements of the loom, the improved head motion being arranged so that smaller and less expensive cams may be employed than in the head motions previously known, providing a smoother connection between the cams and the jack levers, and facilitating the changing of cams or repair or replacement of elements of the head motion, when required.

A further object of the invention is to provide an improved head motion for looms and particularly an improved driving connection between the cams and the associated jack levers of the loom, the improved bead motion providing for a substantial reduction in size of the various elements of the driving connection for the jack levers, providing smoother driving action and reducing wear on the elements, and making it easier to change cams or other elements of the head motion whenever required because of the reduction in size and weight of the respective elements of the head motion.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a side elevational view of a portion of a loom illustrating an improved head motion thereon constructed in accordance with the present invention;

Figure 2 is an enlarged plan view of the head motion employed in Figure 1;

Figure 3 is an enlarged cross sectional view taken on the line 3-3 of Figure 2; and

Figure 4 is an enlarged cross ysectional view taken on the line 4-4 of Figure 3.

Referring to the drawings, 11 designates a conventional loom, similar to that illustrated in my previously issued Patent No. 1,264,095. Designated generally at 13 are the harnesses of the loom which are actuated in a conventional manner by respective jacks 12, said jacks being pivoted at 14 to the frame of the loom for oscillation in parallel vertical planes around the horizontal shaft 14. The respective harnesses 13 are connected to respective jack levers 12 by the usual harness cords 15, as in U. S. Patent No. 1,264,095.

The jack levers 12 are drivingly coupled to respective cams 17 which are rsuitably journaled to the frame of the loom 11 for rotation on a common transverse horizontal axis, as in my above mentioned previous patent. The cams are divided into respective groups which are connected through telescopic shaft elements, as in my previous patent, to respective gears 25, 26 and 27, meshing respectively with gears 28, 29 and 30, secured on a transversely extending drive shaft 31 journaled in the frame j' of the loom. Secured on the shaft 31 opposite the gears Y 1 28, 29 and 30 is a gear 63 and a beveled gear 32. As in "1 my previously issued patent, above mentioned, the gear 63 meshes with a large gear 62 ,employed to drivekthe box motion cams 61,. The beveled gear 32 meshes with a beveled gear 33 secured on the top ,end of avertical shaft Q34 which is coupled in the usual mannerto the crank shaft 35 of the loom to rotate in unison withr said crank shaft.

The cams 17 and 61 are generally circular in shape and are formed with face. Cam .grooves 44 shaped to oscillate the jack levers responsive ,to rotation of the cams, ,the cam grooves extending around central hub portions 45 on their respective cams.

`As will be understood from anexamination of my previously issued patent, No. 1,264,095, rthe respective `jack levers 12 are arranged inalignment Vwith their v associated cams and are provided with drive means for drivingly coupling the jack levers to said cams. Designated at 70 is a transverse shaft secured to the frame of the loom 11 between the shaft 14 and the cams 17 and 61. Pivoted on the shaft 70 are respective outstanding drive levers 71 which are connected at their top ends to the intermediate portions of their associated jack levers 12 by respective link bars 72, the elements 71 and 72 being arranged to form parallelogram linkages with respect to the frame of the loom 11 and their associated jack levers 12, as clearly shown in Figure 3. Pivotally connected at 73 to the intermediate portion of each drive lever 71 is the end of a respective jack connector bar 74. Each jack connector bar 74 is formed with a U-shaped forward end portion 75 extending around the hub 45 of its associated cam, as shown in Figure 4. Iournaled to the bight portion 75 of each jack connector 74 is a roller 76 which engages in the cam groove 44 of the associated cam and provides a driving connection between the cam and the jack connector, the associated hub portion 45 being received in the U-s'haped member 75 and acting as a guide to support the jack connector 74 for reciprocation horizontally. Thus, the rotation of the cam reciprocates jack connectors 74 horizontally and oscillates the parallelogram linkages including the jack lever 12, whereby said jack levers are oscillated simultaneously and in respective phase relationships depending upon the relationships and conigurationsv of the face grooves in the cams.

As in the previously issued Patent 1,264,095, each of the cams lhas differently timed cam grooves to actuate the jacks 12 intermittently according to the divi-sions of the timed grooves.

As it will be apparent from Figure 3, the various elements comprising the driving connection for oscillating the jack lever 12 are relatively small and are therefore relatively light in weight. Said elements are thus inexpensive to fabricate and are relatively easy to handle, whereby replacement or adjustment of the elements is greatly facilitated, as compared with the more cumbersome and massive elements employed in head motions of the prior art.

While a specific embodiment of an improved head motion for a loom has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

l.. In a head motion for looms, a frame, a plurality of cam shafts rotatably mounted on a common axis on said frame, a plurality of jack cams on said shafts formed with face cam grooves and hub portions, reciprocating horizontal jack connectors slidably receiving and engaging said hub portions and having follower rollers engaged in said cam grooves, means drivingly coupled to said cam shafts and arranged to simultaneously rotate same, respective jack levers mounted on said frame in alignment with said jack connectors, and linkage means pivotally connected to said frame, to said jack connectors and to said jack levers, drivingly connecting said jack connectors to said jack levers and arranged to oscillate said jack levers in synchronism with said jack connectors responsive to the reciprocation of said jack connectors by said cams.

2. In a head motion for looms, a frame, a plurality of cam shafts rotatably mounted on a common axis on said frame, a plurality of jack cams on said shafts formed with face cam grooves and hub portions, reciprocating horizontal jackconnectors slidably engaging said hub portions and having follower rollers engaged in said cam grooves, means drivingly coupled to said cam shafts and arranged to simultaneously rotate same, respective jack levers rotatably mounted on said frame in alignment with said jack connectors, respective drive levers pivoted to said frame between said jack levers and said jack connectors and extending parallel to said jack levers, respective horizontal link arms located a substantial distance above the jack connectors and connecting the top ends of said drive levers to the jack levers, and means pivotally connecting the ends of the respective jack connectors to the intermediate portions of the respective drive levers to dene respective parallelogram linkages drivingly connecting said jack connectors to said jack levers and arranged to oscillate said jack levers in synchronism with said jack connectors responsive to the reciprocation of said jack connectors by said cams.

References Cited in the file of this patent UNITED STATES PATENTS 204,466 Walker June 4, 1878 1,264,095 Landry Apr. 23, 1918 1,333,060 Bozzo Mar. 9, 1920 2,043,165 Hall June 2, 1936 FOREIGN PATENTS 273,470 Great Britain July 7, 1927 

